1 files changed, 45 insertions, 0 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index d359d8de22a4..8683e7254d53 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -464,6 +464,51 @@ static struct super_operations fuse_super_operations = {
         .show_options   = fuse_show_options,
 };
 
+static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
+{
+        int i;
+        struct fuse_init_out *arg = &req->misc.init_out;
+
+        if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
+                fc->conn_error = 1;
+        else {
+                fc->minor = arg->minor;
+                fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
+        }
+
+        /* After INIT reply is received other requests can go
+           out.  So do (FUSE_MAX_OUTSTANDING - 1) number of
+           up()s on outstanding_sem.  The last up() is done in
+           fuse_putback_request() */
+        for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
+                up(&fc->outstanding_sem);
+
+        fuse_put_request(fc, req);
+}
+
+static void fuse_send_init(struct fuse_conn *fc)
+{
+        /* This is called from fuse_read_super() so there's guaranteed
+           to be exactly one request available */
+        struct fuse_req *req = fuse_get_request(fc);
+        struct fuse_init_in *arg = &req->misc.init_in;
+        arg->major = FUSE_KERNEL_VERSION;
+        arg->minor = FUSE_KERNEL_MINOR_VERSION;
+        req->in.h.opcode = FUSE_INIT;
+        req->in.numargs = 1;
+        req->in.args[0].size = sizeof(*arg);
+        req->in.args[0].value = arg;
+        req->out.numargs = 1;
+        /* Variable length arguement used for backward compatibility
+           with interface version < 7.5.  Rest of init_out is zeroed
+           by do_get_request(), so a short reply is not a problem */
+        req->out.argvar = 1;
+        req->out.args[0].size = sizeof(struct fuse_init_out);
+        req->out.args[0].value = &req->misc.init_out;
+        req->end = process_init_reply;
+        request_send_background(fc, req);
+}
+
 static unsigned long long conn_id(void)
 {
         static unsigned long long ctr = 1;